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Physics
WAEC / WASSCE 2016
Waves, Sound & Vibrations
Diagram
Solution
The diagram given illustrates the waveform of a note produced by vibrations in an air column of length L. If the speed of sound in air is V, derive an expression for the frequency of the notes
Attached Figure / Diagram
A
\(\frac{V}{L}\)
B
\(\frac{5VL}{2}\)
C
\(\frac{5L}{4V}\)
D
\(\frac{5V}{4L}\)
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
L = \(\frac{5\lambda}{4}\)
\(\lambda = \frac{4L}{5}\)
But \(\lambda = f\lambda\)
f = \(\frac{v}{\lambda} = \frac{v}{\frac{4L}{5}}\)
= \(\frac{5v}{4L}\)
Source: Myschool Past Questions Archive (Record #45644)
Physics
WAEC / WASSCE 2016
Current Electricity & Electric Circuits
The pair of musical instruments that works on the vibration of air in pipes is
A
piano and the organ
B
guitar and the flute
C
trumpet and the violin
D
flute and the trumpet
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #45645)
Physics
WAEC / WASSCE 2016
Lenses & Optical Instruments
Solution
An astronomical telescope has objectives and eye-piece lenses of focal length 3.5m and 5cm respectively. Determine the magnifying power of the telescope when in normal adjustment
A
70.0
B
17.5
C
7.0
D
0.7
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Magnify power = \(\frac{f_o}{f_e}\)
= \(\frac{3.5 \times 100}{5.0}\)
= 70
Source: Myschool Past Questions Archive (Record #45646)
Physics
WAEC / WASSCE 2016
Current Electricity & Electric Circuits
Solution
An aluminium cable of diameter 4 x 10-3m and resistivity 3.0 x 10-8\(\omega\)m has a resistance of 21\(\Omega\). Calculate the length of the cable. (\(\pi = 3.14\))
A
8.0 x 102m
B
8.8 x 103m
C
8.0 x 104m
D
8.8 x 104m
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
R = \(\frac{4eL}{\pid^2}\)
L = \(\frac{R\pid^2}{4e}\)
= \(\frac{21 \times 3.14(4 \times 10^{-3})^2}{4 \times 3.0 x 10^{-8}}\)
= 8.8 x 103m
Source: Myschool Past Questions Archive (Record #45652)
Physics
WAEC / WASSCE 2016
Current Electricity & Electric Circuits
The electricity meters in houses measure energy unit consumed in
A
kilowatt-hour
B
volt
C
ampere
D
coulomb
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #45659)
Physics
WAEC / WASSCE 2016
Circular Motion, Gravitation & Simple Harmonic Motion
Solution
A man and his friend have masses 70kg and 60kg respectively. If they are seated 1.0m apart, calculate the gravitational force of attraction between them. (G = 6.67 x 10-11 Nm2 kg-2)
A
1.59 x 10-14 N
B
2.80 x 10-7 N
C
1.30 x 10-2 N
D
6.30 x 1013 N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = \(\frac{GM_1M_}{r^2}\)
= \(\6.67 \times 10^{-11} \times 70 \times 60}{1^2}\)
= 2.8014 x 10-7 N
Source: Myschool Past Questions Archive (Record #45662)
Physics
WAEC / WASSCE 2016
Electrostatics & Capacitors
Solution
The p.d across a parallel-plate capacitor is 103V. If the distance between the two plates is 10cm. Calculate the magnitude of the electric field strength between the plates.
A
1.0 x 104Vm-1
B
1.0 x 105Vm-1
C
1.5 x 105Vm-1
D
2.0 x 105Vm-1
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
E = \(\frac{v}{d} = \frac{10^3}{0.1}\)
= 10000
= 1.0 x 104Vm-1
Source: Myschool Past Questions Archive (Record #45667)
Physics
WAEC / WASSCE 2016
Gas Laws & Heat Transfer
Two different materials, rubbed against each other acquired opposite charges when separated. This is an example of charging by
A
induction
B
friction
C
conduction
D
convection
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #45669)
Physics
WAEC / WASSCE 2016
Current Electricity & Electric Circuits
Which of the following factors does not affect the e.m.f of a primary cell? Its
A
size
B
internal resistance
C
operating temperature
D
duration of usage
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #45671)
Physics
WAEC / WASSCE 2016
Current Electricity & Electric Circuits
Diagram
Solution
Two magnets are used to magnetize a soft iron bar PQ as illustrated in the diagram given. The correct polarity at P and Q respectively
Attached Figure / Diagram
A
S and N
B
N and N
C
S and S
D
N and S
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Since the striking poles are both south poles of the magnet, therefore, the polarity of P and Q will be north.
Source: Myschool Past Questions Archive (Record #45673)
Physics
WAEC / WASSCE 2016
Magnetism, Electromagnetism & AC Circuits
In storing magnets, keepers are used to
A
reduced self-demagnetization
B
cancel the effect of the earth's magnetic field
C
protect the magnet from stray electric field
D
increase the strangth of the magnets
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #45677)
Physics
WAEC / WASSCE 2016
Magnetism, Electromagnetism & AC Circuits
Solution
A 10\(\mu\)C charge moves with a velocity of 1.0 x 105 ms-1 at right angle to a uniform magnetic field of flux density 5.0 x 10-4T. Calculate the force on the charge
A
5.0 x 10-5N
B
5.0 x 10-4N
C
5.0 x 105N
D
5.0 x 106N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = qvB
= 10 x 10-6 x 1.0 x 105 x 10-4
= 5.0 x 10-4N
Source: Myschool Past Questions Archive (Record #45678)
Physics
WAEC / WASSCE 2016
Current Electricity & Electric Circuits
Which of the following statements is not correct about steel and soft iron?
A
steel is more magnetized than soft iron
B
permanent magnets are usually made of steel
C
soft iron is more readily magnetized than steel
D
soft iron more readily loses its magnetism than steel
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #45682)
Physics
WAEC / WASSCE 2016
Magnetism, Electromagnetism & AC Circuits
What determines the polarity at the ends of an electromagnet? The
A
magnitude of the current passing through the wire
B
material of the core of the magnet
C
material of the coil
D
direction of current in the wire
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #45684)
Physics
WAEC / WASSCE 2016
Atomic, Quantum, Nuclear Physics & Electronics
How many beta particle(s) are emitted in the radioactive decay of \(^{198}_{79}Au \leftarrow ^{198}_{80}Hg\)?
A
1
B
2
C
3
D
5
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #45687)